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79 results about "Panel method" patented technology

Panel Method. A panel method (such as our Panel Flow add-on) is a surface-based, gas and liquid flow analysis technique. Panel methods belong to the field known as Computational Fluid Dynamics (CFD).

Method for predicting movement of FLNG (floating liquefied natural gas) by considering rocking influence of liquid cabin

The invention relates to a method for predicting the movement of FLNG (floating liquefied natural gas) by considering the rocking influence of a liquid cabin. The method comprises the following steps of 1) describing non-linear rocking of liquid in the cabin in a time domain based on a potential flow theory and a panel method to obtain the velocity potential of the rocking of the liquid in the cabin and the pressure of the liquid on the cabin wall caused by the rocking; 2) using the pressure obtained in the step 1) as external force input at the right end of an equation of motion of a ship body, considering the influence of external wave force, calculating motion response of the ship body, obtaining the position of the ship body, and updating a free liquid level; 3) using the obtained position of the ship body at the current moment and the updated free liquid level as boundary conditions of the rocking problem of the liquid in the cabin to obtain the rocking problem of the liquid in the cabin at the next moment, circulating continuously, and stopping after time is set. Compared with the prior art, the method has the advantages of shortening computation time, greatly improving the design efficiency of the liquid cabin and the FLNG and the like.
Owner:SHANGHAI JIAO TONG UNIV

Helicopter flight characteristic computing method considering entire-helicopter aerodynamic interaction

InactiveCN105468814AImprove flight characteristics calculation accuracySolve computational efficiencyGeometric CADSustainable transportationConfiguration designDynamic models
The present invention discloses a helicopter flight characteristic computing method considering entire-helicopter aerodynamic interaction. The method comprises: a helicopter balancing computing method with coupling aerodynamic interaction, a helicopter manipulation response computing method with coupling aerodynamic interaction, and a helicopter stability computing method with coupling aerodynamic interaction. A helicopter entire-helicopter aerodynamic interaction computing model is established by using a vortex panel method and a viscous vortex particle method, and the computing efficiency is improved with two acceleration techniques of multi-pole expansion and vortex element reconstruction, so as to complete helicopter entire-helicopter interaction flow field computation, and solve efficiency and precision problems of helicopter entire-helicopter interaction flow field computation. The entire-helicopter aerodynamic interaction computing model is coupled with a helicopter fight dynamic model; a coupling computation method is established; and an efficient and highly precise flight characteristic computing method that thoroughly makes an aerodynamic interaction wind tunnel test obsolete is formed, thereby achieving the objectives of improving helicopter flight characteristic computation precision and shortening an aerodynamic configuration design cycle. The computing method is applicable to all flight statuses in available helicopter envelopes.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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